Auth bypass in Morelmathieuj Scheduler Widget
CVE-2026-1987
The Scheduler Widget plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 0.1.6. This is due to the `scheduler_widget_ajax_save_event()` function lacking proper authorization checks and ownership verification when updating events. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify any event in the scheduler via the `id` parameter granted they have knowledge of the event ID.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (22.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Morelmathieuj Scheduler Widget — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/fd5f370c-743f-41f1-80ab-7f080…
- plugins.trac.wordpress.org/browser/scheduler-widget/trunk/scheduler-widget.php
- plugins.trac.wordpress.org/browser/scheduler-widget/tags/0.1.6/scheduler-widget…
- owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Secur…
- cwe.mitre.org/data/definitions/639.html
- cwe.mitre.org/data/definitions/862.html
Frequently asked questions
- What is CVE-2026-1987?
- CVE-2026-1987 is a medium-severity vulnerability in Morelmathieuj Scheduler Widget, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-02-14.
- How severe is CVE-2026-1987?
- Medium severity. CVSS v3 base score is 5.4 out of 10.